LG Ultrafine 4K Ambient Light Sensor

Discussion in 'Mac Accessories' started by anferro, Dec 2, 2016.

  1. anferro macrumors newbie

    Dec 1, 2016
    How do I activate the ambient light sensor on the LG Ultrafine 4k from Macbook 15" 2016 with OS Sierra?. In preferences / screen you can only change the brightness manually. Thanks
  2. Brookzy macrumors 601


    May 30, 2010
    I have the same question. My LG UltraFine doesn't seem to be adjusting brightness automatically. Does anyone know?
  3. ABCDEF-Hex, Dec 12, 2016
    Last edited: Dec 12, 2016

    ABCDEF-Hex macrumors 6502


    Feb 15, 2013
    I did find this but it may be old information.
    Or it may not be recognizing the sensor on the display (if it even has one)?

    How to Automatically Adjust Brightness Based on Ambient Light
    Macs with built-in ambient light sensors can monitor the light level nearby and automatically adjust the display’s brightness level to be suitable. This means making the display brighter when it’s bright near you, and making the screen dimmer when you’re in the dark.

    To find this option, open the System Preferences window from the Apple menu and select “Displays.” Enable “Automatically adjust brightness” and your Mac will use the ambient light sensor to automatically adjust the brightness. Disable this option and your Mac won’t do this.


    If you don’t see this option here at all, your Mac doesn’t have an ambient light sensor.

    Despite the name, this option only applies to the ambient light sensor. Even if you disable the “Automatically adjust brightness” option, your Mac will still dim the display when you’re on battery power if you have the “Slightly dim the display while on battery power” option enabled.

    Using the automatic brightness features won’t stop you from being able to adjust the brightness manually. If you ever don’t like the current brightness level, you can change it with a few keypresses. However, your Mac may automatically increase or decrease the brightness level if the lightning near you changes, and you may have to tweak it again.
  4. Brookzy, Dec 12, 2016
    Last edited: Dec 12, 2016

    Brookzy macrumors 601


    May 30, 2010
    This option doesn't show for the LG UltraFine:

    Screen Shot 2016-12-12 at 17.51.48.png

    The brightness is adjustable using an external keyboard however.

    It just doesn't seem to be adjusting automatically.

    I've found the full manual online (it only comes with a quick start guide in the box), and it confirms the dot on the top is an ambient light sensor.

    Screen Shot 2016-12-12 at 17.56.38.png

    It also says:

    Screen Shot 2016-12-12 at 17.56.53.png

    Screen Shot 2016-12-12 at 17.59.12.png

    Which implies the ALS is driven by macOS somehow. Perhaps the functionality will be added in the next point release?

    And I've checked and the monitor's firmware is up to date, so it isn't that.
  5. winstonc macrumors newbie

    Apr 13, 2015
    Just updated to 10.12.2 on my 2015 Macbook and the automatic option has not appeared with the update. Also checked and my monitor seems up to date as well.
  6. Brookzy macrumors 601


    May 30, 2010
    Same. Ambient light sensor simply not working, not even in 10.12.2.
  7. sctw macrumors newbie


    Jun 8, 2016
    Same for me as well. Hopefully on the next update?
  8. LxHunter macrumors 6502

    Nov 14, 2010
    Anyone fine a solution to this.
    Bought the 4K last week
    And still missing the auto adjust
  9. samdale67 macrumors newbie


    Sep 26, 2012
    Fort Worth, Texas
    I'm on 10.13.2 Beta (17C83a) and still no "Automatically adjust brightness" option.
  10. RobinInOR macrumors 6502


    Sep 14, 2014
    Mine doesn’t adjust either and what’s more, if I tone it down so it doesn't blind me, the next time I wake the MBP it goes right back to its brightest setting.
  11. brosenz macrumors regular


    Apr 26, 2011
    I have the exact same problem, currently running the latest macOS 10.13.3 and the latest LG Screen Manager 2.9, no automatic bright adjustment either
  12. MrX8503 macrumors 68020

    Sep 19, 2010
    The hardware is there, but the software isn't. LG hasn't indicated that they'll be supporting it in a future update.
  13. jimthing macrumors 65816


    Apr 6, 2011
    London, UK
    Where have they indicated that?

    Both the 4K and 5K displays have been out well over a year, and they've released bugger all updates to it!
    (Although AFAIR, they did fix the USB-C ports speeds and the sound control.)

    Pretty poor to have to wait a ridiculous time for this, when the hardware is there.

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